1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/param.h>
33 #include <sys/time.h>
34 #include <sys/resource.h>
35 #include <sys/sysctl.h>
36 #include <vm/vm_param.h>
37
38 #include <stdlib.h>
39
40 /*
41 * getloadavg() -- Get system load averages.
42 *
43 * Put `nelem' samples into `loadavg' array.
44 * Return number of samples retrieved, or -1 on error.
45 */
46 int
getloadavg(double loadavg[],int nelem)47 getloadavg(double loadavg[], int nelem)
48 {
49 struct loadavg loadinfo;
50 int i, mib[2];
51 size_t size;
52
53 mib[0] = CTL_VM;
54 mib[1] = VM_LOADAVG;
55 size = sizeof(loadinfo);
56 if (sysctl(mib, 2, &loadinfo, &size, NULL, 0) < 0)
57 return (-1);
58
59 nelem = MIN(nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t));
60 for (i = 0; i < nelem; i++)
61 loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale;
62 return (nelem);
63 }
64